Wound Staging as Defined by the National Pressure Ulcer Advisory Panel
| Stage | Description |
|---|---|
| I | Erythematous skin with no lesions |
| II | Lesions affecting the dermis or parts of it or presence of blisters |
| III | Full-thickness wound only |
| IV | Full-thickness wound with bone, joint, or tendon involvement |
| Unstageable | Full-thickness wound with eschar at the base |